Radioswitch



June 10; 1924.. 1.497; 586' B. w. PRALL RADIOSWITCII Filed May 16. 1923 mus 5555 11v VENTOR 51c YAN WPR L Z5? M BY z; ATTORNEYS Patented June 10,1924.

UNITED" STATES PATENT orrics,

BRYAN W. IPB'ALL, 01? 153W YORK, N. Y.

RADIGSWETCK.

Application filed K9416,

Twill] whom canoe/nit; it known that I, BRYAN W. Prison, a icitizen of the United States. and it resident of the city of New York, West New Brigh- I With the wide introduction of radio receivin scts'provided with vacuum tubes, for em liging the waves. of radiant energy of An io roquency and audio-frequenc it henecessary to provide means or consecutivelyronnecting any desired number 'bf tubes into the radio-receiving circuits.

The introduction of any desired number ofvacmim tubes into-the circuits of the radio "receiving set may be. accomplished when arrangin arable dc ay and often those unskill making the original assemblage, but if it becomes necessary or desirable to'cut down the number of stages'of amplification then the connections have to be rearranged. The reoi. the connections causes considin the. art find it impossible to reestablish "the-in, radio-receiving circuits after they have been disconnected in order-to rearrang the connections to eliminate or introduce vacuum tubes. r

i The general object of this invention is the provision of a cheap, simple and eificient "1923. semi no. scum.

will be more clearly understood from the 'followingdeteiled description and accompanying drawings.

Figure 1 is a side elevation of the radio switch showing its construction;

Figure 2 is a side elevation of the radio switch showing the plug associated with the first pair of long line springs, establishing connections therewith;

Figure 3 is a, side elevation of the radio switch showing the plug crating the first pair of long line springs, choing them into contact with the corresponding members of the associated pair of short line 5 rings and establishing connections with t e second pair of long line slprings;

Ingram showm Figure 4- 18 a how the radio switch might be connected in a radio receiving circuit in order to introduce differcnt stages of amplification into the receiving circuit.

Referring to the above-mentioned drawings, the invention includes a frame on which a plurality of spaced long and short springs 11 to 20, inclusive, are mounted. These springs are mounted in pairs and are spaced and insulated from one another by insuluting'bloclcs 21. The long springs to 20, inclusive, are made of varying lengths and have provided on their lower ends in-- turned portions which are engaged by a plug 23. The short springs 11 and 12 are associated with the springs 15 and 16, respectively, while the springs 13 and 14- are associated with the long springs 17 and 18,

radio switch provided h DQLfi respectively. In mounting the springs 15 to ducing any desired number of vacuum tubes into radio-receiving circuits in order to give springs, and

' here of the pair any desired number of stages of amplification of the received waves or" radiantcnr er by the adjustment of a lug,

ding object is accomplishet by mountin on a frame a plurality of pairs of short on long line springs spaced from one another by insulating members, each of short springs being associated with pairpi long providing it plug having two contactxnembers insulated from each other for establishing connections with any pair of long springs, andxen insuleting member for operating pairs long sprin s to force them into contact 1 correspon I sted short springs therewith. This end other 20, inclusive, one member of each pair is ositioned so as. to extend beyond the ot or member of the pair. Contact members 22 are mounted on the springs 11 to 18, inclusive, for establishing contact between the corresponding members of the difierent long and short sprin when the long springs are operatdw 'A- s eeve 24 is mounted in the frame 1% for directing the p lu 23 between the long sprin 15 to 20, inc naive. The plug 23 inclu es two contact members 25 and 27, insulated from one another by the member '28, These contact members 25 and 2? would be normally connected by conductors to any heed set. An insulstm sleeve 28 is mounted the lower ends of t is conteat members and 27.

in the operation of the switch, when the :Jsjfifii-Q the invention plug is projected through the sleeve 24 into no engagement with the springs and 18, con

tact member contacts with'the spring 16, and. the contact member 27 contacts with the spring 15. When the plug is projected another step the insulating sleeve 28 is projected between the springs 15 and 16 and the contaetmember 25 contacts with the spring "18 while the contact member 27 contacts with the spring 17. The projecting of the sleeve 28 between the springs 15 and 16 forces them outward, establishing contact 1' with the springs 11 and 12, respectively, 2 through the contact members 22. On forc- 1 verse operation 1 the sleeve 28 is in the plug a third etc a P and 18 and projected between the springs 17 the contact member 25 contacts with the v igure 4 shows adiagram illustrating connections that might be made to use the above-described switch for introducing any desired'number of stages ofamplification I mary of the 'ductors 29 and to into a radio receiving circuit. The pair of springs ,11 and 12 is connected by conductors and 36 to the terminals of the pritransformer 11 while the springs 15 and 16 are connected by conthe plate of the vacuum tube 31 and the positive pole of the battery 4'2. Conductors 37 and connect the springs 13 and 14 to the terminals of the primary of the transformer 13, while conductors 38 and 39 connect the springs 17 and 18 to the positive terminal of the hattery 12 and the plate of the vacuum tube 33, respectively. The inner springs 19 and 20 are connected by the conductors 44 and 4:5 to the positive pole of the battery 42 and theplate of the vacuumtube 34, respectively. When the plug is projected bett'veen the springs 15 and 16 so that the contact member25 contacts with the spring 16 and ,the contact member 27 with the spring 15 the tube 31 is introducedinto the receiving circuit,giving one stage of amplification or detection. As the plug 23 is moved step.

by step the vacuum tubes 33 and 34 are introduced into the circuit, finally giving three stages of amplification or of detection and two stages of audio-amplification. v

I would state in conclusion that while the illustratedenample constitutes a practical embodiment of my invention 1 do not limit myself strictly to the-exact details herein illustrated since manifestly thesame can be considerably varied without de arting' from the spirit of the invention as eiined in the appended claim one stage naezaee *Qlaims 1. A radio switch, comprising a frame, a

plurality of pairs of short and long line springs mounted on the frame, each pair of short line springs being associated with a pair of long line springs, and means for successively establishing electric connection with the pairs of long line springs and for operating the pairs of long line springs to project then into contact with corresponding springs of the pair of short line springs with which they are associated. ,7 3

2. A radio switch comprising a frame, a plurality of pairs of short. and 'long line springs mounted on the frame, each pair of short line springs being associated with a pair of long line springs, a plug for: successively establishing electrical connection with the pairs of long line springs to estab lish electric circuits. and means carried by the plug for operating the long linesprings to project them into contact with corre? spending short line springs to maintain said circuits established as the plug advances step by step. .1 3. A radio switch, comprising a frame, a plurality of pairs of short and long line springs mounted on the frame,each. pair or short line springs being associated with a pair of long line springs, and meansfor establishing electrical connection, with any pair oflong line springs and for operating pairs of long line springs to project them into contact with corresponding springs of the pair of short line springs'with which they are associated.

4. A radio switch, comprising a frame, a plurality of springs mounted on the frame, each pair of short line springs being associated with a pair of long line springs, and a plug for operating said line springs comprising two insulated contact members for establishing connection with any pair of long line springs and an insulating member for operpairs of short and long" line sting pairs of long line springs to project 1 them outward into contactwith correspond has short line springs to ,es'tablishelectric circuits. r

5. A radio switch, comprising a frame, a plurality of pairs of short and long line springs mounted on the frame, each pair" ofsiiort linefiprings being associated with a pair of long line springs, said pairs oi long line springsbeing so positioned that the end of one member of each pair extends beyond the other member, and a plug having two insulated contact members or establishing? connections with any pair of long means for operating. pairs.

line springs and of long line springs to force them into con-- tact with corresponding: members of the short line springs to establish electric olr- BRYAN w. reach 

